$CMC
COMMERCIAL METALS Co Stock $cmc

$cmc Overview Financials Valuation SEC Filings Company Website

2020 Q3 Form 10-K Financial Statement

#000002244420000047 Filed on October 15, 2020

Income Statement

Concept	2020 Q3	2020 Q2	2020 Q1
Revenue	$1.409B	$1.342B	$1.341B
YoY Change	-8.68%	-16.45%	-4.41%
Cost Of Revenue	$1.146B	$1.116B	$1.123B
YoY Change	-11.32%	-18.17%	-10.33%
Gross Profit	$263.4M	$225.3M	$217.9M
YoY Change	4.25%	-6.75%	44.96%
Gross Profit Margin	18.69%	16.79%	16.25%
Selling, General & Admin	$128.2M	$116.0M	$115.5M
YoY Change	58.66%	0.45%	17.03%
% of Gross Profit	48.67%	51.46%	53.03%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$41.70M	$41.80M	$41.40M
YoY Change	1.46%	1.46%	0.49%
% of Gross Profit	15.83%	18.55%	19.0%
Operating Expenses	$128.2M	$116.0M	$115.5M
YoY Change	58.66%	0.45%	17.03%
Operating Profit	$135.2M	$109.4M	$102.3M
YoY Change	-21.33%	-13.33%	98.45%
Interest Expense	-$14.00M	$15.41M	$15.89M
YoY Change	-13.58%	-16.77%	-14.1%
% of Operating Profit	-10.35%	14.09%	15.53%
Other Income/Expense, Net
YoY Change
Pretax Income	$86.30M	$87.97M	$86.44M
YoY Change	-15.97%	-18.28%	161.4%
Income Tax	$18.50M	$23.80M	$22.85M
% Of Pretax Income	21.44%	27.06%	26.43%
Net Earnings	$67.62M	$64.73M	$63.80M
YoY Change	-21.47%	-17.42%	360.64%
Net Earnings / Revenue	4.8%	4.82%	4.76%
Basic Earnings Per Share	$0.57	$0.54	$0.54
Diluted Earnings Per Share	$0.56	$0.54	$0.53
COMMON SHARES
Basic Shares Outstanding		119.2M shares	118.9M shares
Diluted Shares Outstanding		120.3M shares	120.4M shares

Balance Sheet

Concept	2020 Q3	2020 Q2	2020 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$542.1M	$462.1M	$232.4M
YoY Change	181.61%	284.12%	248.43%
Cash & Equivalents	$545.0M	$464.2M	$233.9M
Short-Term Investments
Other Short-Term Assets	$165.9M	$157.4M	$176.0M
YoY Change	-7.38%	-8.5%	9.71%
Inventory	$625.4M	$644.9M	$714.8M
Prepaid Expenses
Receivables	$880.7M	$880.6M	$961.7M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$2.214B	$2.145B	$2.085B
YoY Change	6.45%	1.46%	0.71%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.571B	$1.513B	$1.522B
YoY Change	4.67%	2.71%	2.98%
Goodwill	$64.32M	$64.13M	$64.17M
YoY Change	0.29%	-0.16%	-0.13%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$232.2M	$232.3M	$236.4M
YoY Change	104.33%	101.75%	104.08%
Total Long-Term Assets	$1.868B	$1.810B	$1.823B
YoY Change	11.25%	9.5%	9.92%
TOTAL ASSETS
Total Short-Term Assets	$2.214B	$2.145B	$2.085B
Total Long-Term Assets	$1.868B	$1.810B	$1.823B
Total Assets	$4.082B	$3.955B	$3.908B
YoY Change	8.59%	4.99%	4.81%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$266.1M	$230.3M	$275.5M
YoY Change	-7.6%	-17.28%	-14.47%
Accrued Expenses	$461.0M	$363.1M	$329.9M
YoY Change	30.31%	13.82%	24.07%
Deferred Revenue	$25.45M	$21.90M	$38.39M
YoY Change	-31.52%	-38.85%	115.79%
Short-Term Debt	$0.00	$2.765M	$8.272M
YoY Change	-100.0%	-89.08%	-86.09%
Long-Term Debt Due	$18.15M	$14.50M	$14.40M
YoY Change	34.44%	-51.01%	-51.02%
Total Short-Term Liabilities	$745.3M	$627.3M	$649.1M
YoY Change	7.3%	-10.92%	-13.72%
LONG-TERM LIABILITIES
Long-Term Debt	$1.066B	$1.154B	$1.145B
YoY Change	-13.18%	-11.71%	-12.64%
Other Long-Term Liabilities	$250.7M	$243.5M	$232.5M
YoY Change	87.63%	89.83%	79.71%
Total Long-Term Liabilities	$250.7M	$243.5M	$232.5M
YoY Change	87.63%	89.83%	79.71%
TOTAL LIABILITIES
Total Short-Term Liabilities	$745.3M	$627.3M	$649.1M
Total Long-Term Liabilities	$250.7M	$243.5M	$232.5M
Total Liabilities	$2.192B	$2.154B	$2.150B
YoY Change	2.7%	-2.21%	-3.6%
SHAREHOLDERS EQUITY
Retained Earnings	$1.808B	$1.754B	$1.704B
YoY Change	14.03%	15.93%	17.59%
Common Stock	$360.2M	$358.1M	$352.8M
YoY Change	0.07%	1.12%	1.53%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$175.1M	$177.5M	$177.6M
YoY Change	-11.29%	-10.05%	-10.05%
Treasury Stock Shares	9.840M shares	9.996M shares	9.999M shares
Shareholders Equity	$1.889B	$1.800B	$1.758B
YoY Change
Total Liabilities & Shareholders Equity	$4.082B	$3.955B	$3.908B
YoY Change	8.59%	4.99%	4.81%

Cashflow Statement

Concept	2020 Q3	2020 Q2	2020 Q1
OPERATING ACTIVITIES
Net Income	$67.62M	$64.73M	$63.80M
YoY Change	-21.47%	-17.42%	360.64%
Depreciation, Depletion And Amortization	$41.70M	$41.80M	$41.40M
YoY Change	1.46%	1.46%	0.49%
Cash From Operating Activities	$259.4M	$278.4M	$107.0M
YoY Change	1.53%	107.14%	2176.6%
INVESTING ACTIVITIES
Capital Expenditures	-$53.50M	-$37.50M	-$51.00M
YoY Change	13.83%	54.32%	72.3%
Acquisitions
YoY Change
Other Investing Activities	-$10.50M	$100.0K	-$5.300M
YoY Change	-850.0%	-90.0%	-13.11%
Cash From Investing Activities	-$64.00M	-$37.40M	-$56.40M
YoY Change	40.35%	60.52%	57.98%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-115.1M	-10.60M	-42.70M
YoY Change	-16.65%	-81.37%	-202.89%
NET CHANGE
Cash From Operating Activities	259.4M	278.4M	107.0M
Cash From Investing Activities	-64.00M	-37.40M	-56.40M
Cash From Financing Activities	-115.1M	-10.60M	-42.70M
Net Change In Cash	80.30M	230.4M	7.900M
YoY Change	11.84%	325.09%	-24.76%
FREE CASH FLOW
Cash From Operating Activities	$259.4M	$278.4M	$107.0M
Capital Expenditures	-$53.50M	-$37.50M	-$51.00M
Free Cash Flow	$312.9M	$315.9M	$158.0M
YoY Change	3.44%	99.05%	360.64%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000022444
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Irving
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--08-31
CY2020Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	119580359	shares
CY2020Q1	cmc	Minimum Percentage Of Share Ownership Deemed Affiliates MinimumPercentageOfShareOwnershipDeemedAffiliates	0.10
CY2017Q3	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201802Member
CY2018Q3	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201409Member
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
CY2020Q3	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-08-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-4304
CY2020	dei	Entity Registrant Name EntityRegistrantName	Commercial Metals Company
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	6565 N. MacArthur Blvd.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	75-0725338
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	75039
CY2020	dei	City Area Code CityAreaCode	214
CY2020	dei	Local Phone Number LocalPhoneNumber	689-4300
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value
CY2020	dei	Trading Symbol TradingSymbol	CMC
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020Q1	dei	Entity Public Float EntityPublicFloat	2200000000	USD
CY2020Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	119580359	shares
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5476486000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5829002000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	4643723000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	4531688000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5025514000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	4021558000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	504572000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	463271000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	401452000	USD
CY2020	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	7611000	USD
CY2019	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	384000	USD
CY2018	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	14372000	USD
CY2020	us-gaap	Interest Expense InterestExpense	61837000	USD
CY2019	us-gaap	Interest Expense InterestExpense	71373000	USD
CY2018	us-gaap	Interest Expense InterestExpense	40957000	USD
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	5105708000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	5560542000	USD
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	4478339000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	370778000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	268460000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	165384000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	92476000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30147000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	278302000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	198779000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	135237000	USD
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	1907000	USD
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-528000	USD
CY2018	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	3235000	USD
CY2020	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	706000	USD
CY2019	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	158000	USD
CY2018	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-34000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	1201000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-686000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	3269000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	279503000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	198093000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	138506000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.34
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.69
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.16
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.01
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.03
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.35
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.68
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.19
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.31
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.67
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.14
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.01
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.03
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.32
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
CY2020	us-gaap	Net Income Loss NetIncomeLoss	279503000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	198093000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	138506000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	33559000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-29718000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-13938000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-6000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-857000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-2079000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	33565000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-28861000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-11859000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-12136000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-6000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	48000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	304000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	244000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	279000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-12440000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-250000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-231000	USD
CY2020	cmc	Other Comprehensive Income Loss Defined Benefit Plan Gain Loss After Tax OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossAfterTax	-796000	USD
CY2019	cmc	Other Comprehensive Income Loss Defined Benefit Plan Gain Loss After Tax OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossAfterTax	-2629000	USD
CY2018	cmc	Other Comprehensive Income Loss Defined Benefit Plan Gain Loss After Tax OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossAfterTax	-138000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-86000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-126000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-53000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-25000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-62000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	1316000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	763000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1338000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	74000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20362000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-30449000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12164000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	299865000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	167644000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	126342000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	542103000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	192461000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	9597000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	8403000	USD
CY2020Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	880728000	USD
CY2019Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1016088000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	625393000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	692368000	USD
CY2020Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	165879000	USD
CY2019Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	179088000	USD
CY2020Q3	us-gaap	Assets Current AssetsCurrent	2214103000	USD
CY2019Q3	us-gaap	Assets Current AssetsCurrent	2080005000	USD
CY2020Q3	us-gaap	Land Land	143567000	USD
CY2019Q3	us-gaap	Land Land	142825000	USD
CY2020Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	786820000	USD
CY2019Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	750381000	USD
CY2020Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	2364923000	USD
CY2019Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	2234800000	USD
CY2020Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	103776000	USD
CY2019Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	68579000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3399086000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3196585000	USD
CY2020Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1828019000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1695614000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1571067000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1500971000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	64321000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	64138000	USD
CY2020Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	232237000	USD
CY2019Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	113657000	USD
CY2020Q3	us-gaap	Assets Assets	4081728000	USD
CY2019Q3	us-gaap	Assets Assets	3758771000	USD
CY2020Q3	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	266102000	USD
CY2019Q3	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	288005000	USD
CY2020Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	454977000	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	353786000	USD
CY2020Q3	cmc	Business Combination Acquired Unfavorable Contract Backlog BusinessCombinationAcquiredUnfavorableContractBacklog	6035000	USD
CY2019Q3	cmc	Business Combination Acquired Unfavorable Contract Backlog BusinessCombinationAcquiredUnfavorableContractBacklog	35360000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	18149000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	17439000	USD
CY2020Q3	us-gaap	Liabilities Current LiabilitiesCurrent	745263000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	694590000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	130810000	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	79290000	USD
CY2020Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	250706000	USD
CY2019Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	133620000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1065536000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1227214000	USD
CY2020Q3	us-gaap	Liabilities Liabilities	2192315000	USD
CY2019Q3	us-gaap	Liabilities Liabilities	2134714000	USD
CY2020Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2020Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	129060664	shares
CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	129060664	shares
CY2020Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	119220905	shares
CY2019Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	117924938	shares
CY2020Q3	us-gaap	Common Stock Value CommonStockValue	1290000	USD
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	1290000	USD
CY2020Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	358912000	USD
CY2019Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	358668000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-103764000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-124126000	USD
CY2020Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1807826000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1585379000	USD
CY2020Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	9839759	shares
CY2019Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	11135726	shares
CY2020Q3	us-gaap	Treasury Stock Value TreasuryStockValue	175063000	USD
CY2019Q3	us-gaap	Treasury Stock Value TreasuryStockValue	197350000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	1889201000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	1623861000	USD
CY2020Q3	us-gaap	Minority Interest MinorityInterest	212000	USD
CY2019Q3	us-gaap	Minority Interest MinorityInterest	196000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1889413000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1624057000	USD
CY2020Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4081728000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3758771000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	279503000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	198093000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	138506000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	165758000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	158671000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	131659000	USD
CY2020	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	49580000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	49523000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	14377000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	31850000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	25106000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	23929000	USD
CY2020	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	29367000	USD
CY2019	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	74784000	USD
CY2018	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	0	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	7611000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	384000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	15053000	USD
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	4213000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2281000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1322000	USD
CY2020	us-gaap	Inventory Write Down InventoryWriteDown	2065000	USD
CY2019	us-gaap	Inventory Write Down InventoryWriteDown	723000	USD
CY2018	us-gaap	Inventory Write Down InventoryWriteDown	1407000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	1778000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	578000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	388000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2510000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-146375000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-27204000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	10802000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-78903000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-89664000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	43198000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	45718000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-15315000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-20163000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-15065000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	52851000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	15423000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	0	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	367521000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable From Securitization IncreaseDecreaseInAccountsReceivableFromSecuritization	670457000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	791204000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	37004000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-433924000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	187618000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	138836000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	174655000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	18137000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	700941000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	6980000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	11843000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3910000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	8103000	USD
CY2020	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	974000	USD
CY2019	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	6298000	USD
CY2018	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	102857000	USD
CY2020	cmc	Advances Under Accounts Receivable Programs AdvancesUnderAccountsReceivablePrograms	0	USD
CY2019	cmc	Advances Under Accounts Receivable Programs AdvancesUnderAccountsReceivablePrograms	0	USD
CY2018	cmc	Advances Under Accounts Receivable Programs AdvancesUnderAccountsReceivablePrograms	226325000	USD
CY2020	cmc	Repayments Under Accounts Receivable Programs RepaymentsUnderAccountsReceivablePrograms	0	USD
CY2019	cmc	Repayments Under Accounts Receivable Programs RepaymentsUnderAccountsReceivablePrograms	0	USD
CY2018	cmc	Repayments Under Accounts Receivable Programs RepaymentsUnderAccountsReceivablePrograms	304178000	USD
CY2020	cmc	Increase Decreasein Accounts Receivablefrom Securitization Investing Activities IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities	0	USD
CY2019	cmc	Increase Decreasein Accounts Receivablefrom Securitization Investing Activities IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities	-367521000	USD
CY2018	cmc	Increase Decreasein Accounts Receivablefrom Securitization Investing Activities IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities	-670457000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-192938000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-462048000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	521929000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	62539000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	180000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	350000000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	127704000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	246523000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	19967000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	234482000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	288896000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	USD
CY2020	cmc	Repayments Under Accounts Receivable Programs Financing Activities RepaymentsUnderAccountsReceivableProgramsFinancingActivities	237828000	USD
CY2019	cmc	Repayments Under Accounts Receivable Programs Financing Activities RepaymentsUnderAccountsReceivableProgramsFinancingActivities	296033000	USD
CY2018	cmc	Repayments Under Accounts Receivable Programs Financing Activities RepaymentsUnderAccountsReceivableProgramsFinancingActivities	0	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	57056000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	56537000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	56076000	USD
CY2020	cmc	Proceeds Paymentsfrom Issuanceof Sharesunder Incentiveand Sharebased Compensation Plans Including Tax Withholdings ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings	-3420000	USD
CY2019	cmc	Proceeds Paymentsfrom Issuanceof Sharesunder Incentiveand Sharebased Compensation Plans Including Tax Withholdings ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings	-1876000	USD
CY2018	cmc	Proceeds Paymentsfrom Issuanceof Sharesunder Incentiveand Sharebased Compensation Plans Including Tax Withholdings ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings	-9302000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	5254000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	16000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	10000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	31000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-247790000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-13244000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	259432000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	759000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-598000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-703000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	351235000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-438886000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	346734000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	193729000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	632615000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	285881000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	544964000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	193729000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	632615000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	44499000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	7977000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	7198000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	59711000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	65190000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	39972000	USD
CY2020	cmc	Capital Lease Obligations Incurredandchangesinaccountspayablesrelatedtopropertyplantandequipment CapitalLeaseObligationsIncurredandchangesinaccountspayablesrelatedtopropertyplantandequipment	25100000	USD
CY2019	cmc	Capital Lease Obligations Incurredandchangesinaccountspayablesrelatedtopropertyplantandequipment CapitalLeaseObligationsIncurredandchangesinaccountspayablesrelatedtopropertyplantandequipment	57640000	USD
CY2018	cmc	Capital Lease Obligations Incurredandchangesinaccountspayablesrelatedtopropertyplantandequipment CapitalLeaseObligationsIncurredandchangesinaccountspayablesrelatedtopropertyplantandequipment	32274000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	542103000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	192461000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	622473000	USD
CY2020Q3	us-gaap	Restricted Cash RestrictedCash	2861000	USD
CY2019Q3	us-gaap	Restricted Cash RestrictedCash	1268000	USD
CY2018Q3	us-gaap	Restricted Cash RestrictedCash	10142000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	544964000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	193729000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	632615000	USD
CY2017Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1400930000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	138506000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12164000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	56076000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-9301000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	16168000	USD
CY2018	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	13000	USD
CY2017Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	259000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	15248000	USD
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1493583000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	198093000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-30449000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	56537000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-1875000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	21052000	USD
CY2019	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	10000	USD
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-2747000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	2927000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1624057000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	279503000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20362000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	57056000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-3420000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	23441000	USD
CY2020	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	16000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	2510000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1889413000	USD
CY2020	us-gaap	Nature Of Operations NatureOfOperations	<div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">NOTE 1. NATURE OF OPERATIONS </span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">Nature of Operations</span><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;"> </span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">Commercial Metals Company ("CMC") and its subsidiaries (collectively, the "Company," "we," "our" or "us") manufacture, recycle and fabricate steel and metal products, related materials and services through a network of facilities that includes seven electric arc furnace ("EAF") mini mills, two EAF micro mills, two rerolling mills, steel fabrication and processing plants, construction-related product warehouses and metal recycling facilities in the United States ("U.S.") and Poland.</span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">The Company has two reportable segments: North America and Europe.</span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">North America</span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">The North America segment is a vertically integrated network of recycling facilities, steel mills and fabrication operations located in the U.S. The recycling facilities process ferrous and nonferrous scrap metals (collectively known as "raw materials") for use by manufacturers of new metal products. The steel mills manufacture finished long steel products including reinforcing bar ("rebar"), merchant bar, light structural and other special sections as well as semi-finished billets for rerolling and forging applications (collectively known as "steel products"). The fabrication operations primarily manufacture fabricated rebar and steel fence posts (collectively known as "downstream products"). The strategy in North America is to optimize the Company's vertically integrated value chain to maximize profitability by obtaining the lowest possible input costs and highest possible selling prices. The Company operates the recycling facilities to provide low-cost scrap to the steel mills and the fabrication operations to optimize the steel mill volumes. The North America segment's products are sold primarily to steel mills and foundries, construction, fabrication and other manufacturing industries. </span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">Europe</span></div>The Europe segment is a vertically integrated network of recycling facilities, an EAF mini mill, and fabrication operations located in Poland. The steel products manufactured by this segment include rebar, merchant bar and wire rod as well as semi-finished billets. In addition, the downstream products manufactured by this segment's fabrication operations include fabricated rebar, fabricated mesh, assembled rebar cages and other fabricated rebar by-products. The Europe segment's products are sold primarily to fabricators, manufacturers, distributors and construction companies.
CY2020	us-gaap	Nature Of Operations NatureOfOperations	<div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">NOTE 1. NATURE OF OPERATIONS </span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">Nature of Operations</span><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;"> </span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">Commercial Metals Company ("CMC") and its subsidiaries (collectively, the "Company," "we," "our" or "us") manufacture, recycle and fabricate steel and metal products, related materials and services through a network of facilities that includes seven electric arc furnace ("EAF") mini mills, two EAF micro mills, two rerolling mills, steel fabrication and processing plants, construction-related product warehouses and metal recycling facilities in the United States ("U.S.") and Poland.</span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">The Company has two reportable segments: North America and Europe.</span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">North America</span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">The North America segment is a vertically integrated network of recycling facilities, steel mills and fabrication operations located in the U.S. The recycling facilities process ferrous and nonferrous scrap metals (collectively known as "raw materials") for use by manufacturers of new metal products. The steel mills manufacture finished long steel products including reinforcing bar ("rebar"), merchant bar, light structural and other special sections as well as semi-finished billets for rerolling and forging applications (collectively known as "steel products"). The fabrication operations primarily manufacture fabricated rebar and steel fence posts (collectively known as "downstream products"). The strategy in North America is to optimize the Company's vertically integrated value chain to maximize profitability by obtaining the lowest possible input costs and highest possible selling prices. The Company operates the recycling facilities to provide low-cost scrap to the steel mills and the fabrication operations to optimize the steel mill volumes. The North America segment's products are sold primarily to steel mills and foundries, construction, fabrication and other manufacturing industries. </span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">Europe</span></div>The Europe segment is a vertically integrated network of recycling facilities, an EAF mini mill, and fabrication operations located in Poland. The steel products manufactured by this segment include rebar, merchant bar and wire rod as well as semi-finished billets. In addition, the downstream products manufactured by this segment's fabrication operations include fabricated rebar, fabricated mesh, assembled rebar cages and other fabricated rebar by-products. The Europe segment's products are sold primarily to fabricators, manufacturers, distributors and construction companies.
CY2020Q3	cmc	Numberof Electric Arc Furnace Mini Mills NumberofElectricArcFurnaceMiniMills	7	mini_mill
CY2020Q3	cmc	Numberof Electric Arc Furnace Micro Mills NumberofElectricArcFurnaceMicroMills	2	micro_mill
CY2020Q3	cmc	Number Of Rerolling Mills NumberOfRerollingMills	2	numberOfRerollingMills
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segments
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">Use of Estimates</span><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;"> </span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">The preparation of the Company's consolidated financial statements in accordance with accounting principles generally accepted in the United States ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and reported amounts of net sales and expenses during the reporting period. Significant items subject to such estimates and assumptions include revenue recognition, income taxes, carrying value of inventory, acquisitions, goodwill, long-lived assets and contingencies. Actual results could differ significantly from these estimates and assumptions.</span></div>
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">Use of Estimates</span><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;"> </span></div><div style="text-align:justify;"><span><br/></span></div><div style="text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">The preparation of the Company's consolidated financial statements in accordance with accounting principles generally accepted in the United States ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and reported amounts of net sales and expenses during the reporting period. Significant items subject to such estimates and assumptions include revenue recognition, income taxes, carrying value of inventory, acquisitions, goodwill, long-lived assets and contingencies. Actual results could differ significantly from these estimates and assumptions.</span></div>
CY2020	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	6200000	USD
CY2018Q4	cmc	Numberof Rebar Fabrication Facilities NumberofRebarFabricationFacilities	33	fabrication_facility
CY2018Q4	cmc	Numberof Electric Arc Furnace Mini Mills NumberofElectricArcFurnaceMiniMills	4	mini_mill
CY2018Q4	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	701200000	USD
CY2020	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	1400000000	USD
CY2020	us-gaap	Business Combination Pro Forma Information Earnings Or Loss Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	132700000	USD
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	32100000	USD
CY2019	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	6033908000	USD
CY2018	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	6303812000	USD
CY2019	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	162255000	USD
CY2018	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	105377000	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	51700000	USD
CY2019Q4	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	9800000	USD
CY2020	cmc	Number Of Facilities Idled NumberOfFacilitiesIdled	6	location
CY2018	us-gaap	Severance Costs1 SeveranceCosts1	6700000	USD
CY2017Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-81513000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-14454000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-2563000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	273000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12164000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-93677000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-33071000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-2222000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-30449000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-103764000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-124126000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	17624000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	369000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-3107000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	20362000	USD
CY2020Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	53275000	USD
CY2019Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	103805000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	25450000	USD
CY2019Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	37165000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	723400000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.40
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.48
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.12
CY2020Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	123900000	USD
CY2019Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	143700000	USD
CY2018Q3	us-gaap	Goodwill Gross GoodwillGross	74509000	USD
CY2019	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	-184000	USD
CY2019Q3	us-gaap	Goodwill Gross GoodwillGross	74325000	USD
CY2020	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	195000	USD
CY2020Q3	us-gaap	Goodwill Gross GoodwillGross	74520000	USD
CY2018Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10199000	USD
CY2019	cmc	Goodwill Impairment Foreign Currency Translation GoodwillImpairmentForeignCurrencyTranslation	12000	USD
CY2019Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10187000	USD
CY2020	cmc	Goodwill Impairment Foreign Currency Translation GoodwillImpairmentForeignCurrencyTranslation	-12000	USD
CY2020Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10199000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	64310000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-172000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	64138000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	183000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	64321000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	22069000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	9421000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	12648000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	20766000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	7454000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	13312000	USD
CY2018Q4	cmc	Business Combination Acquired Unfavorable Contract Backlog BusinessCombinationAcquiredUnfavorableContractBacklog	110200000	USD
CY2020Q3	cmc	Business Combination Acquired Unfavorable Contract Backlog BusinessCombinationAcquiredUnfavorableContractBacklog	6000000.0	USD
CY2019Q3	cmc	Business Combination Acquired Unfavorable Contract Backlog BusinessCombinationAcquiredUnfavorableContractBacklog	35400000	USD
CY2020	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	29400000	USD
CY2019	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	74800000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2100000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2200000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2200000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	2030000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1755000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1296000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1259000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	922000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	114905000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	50642000	USD
CY2020Q3	cmc	Right Of Use Asset RightOfUseAsset	165547000	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	27604000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	95810000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	123414000	USD
CY2020Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	14373000	USD
CY2020Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	35851000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	50224000	USD
CY2020Q3	cmc	Lease Liability LeaseLiability	173638000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	35611000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	11445000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1792000	USD
CY2020	cmc	Finance Lease Cost FinanceLeaseCost	13237000	USD
CY2020	cmc	Variable And Short Term Lease Cost VariableAndShortTermLeaseCost	17020000	USD
CY2020	us-gaap	Lease Cost LeaseCost	65868000	USD
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y3M18D
CY2019Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y9M18D
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.04283
CY2020Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.04270
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	36063000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1720000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	12774000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	43642000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	26573000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	32350000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	16227000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	27015000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	14037000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	22035000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	11675000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	16761000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	8968000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	12052000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	3569000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	32312000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	69000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	142525000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	54545000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	19111000	USD
CY2020Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	4321000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	123414000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	50224000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	41331000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	13104000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	10004000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	7758000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	5831000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	3904000	USD
CY2019Q3	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	730000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	124817000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	34511000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	27383000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	22074000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	17433000	USD
CY2019Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	1254921000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	10478000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	12938000	USD
CY2020Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	1092266000	USD
CY2020Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	8581000	USD
CY2019Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	10268000	USD
CY2020Q3	cmc	Longterm Debtand Capital Lease Obligations Net LongtermDebtandCapitalLeaseObligationsNet	1083685000	USD
CY2019Q3	cmc	Longterm Debtand Capital Lease Obligations Net LongtermDebtandCapitalLeaseObligationsNet	1244653000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	18149000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	17439000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1065536000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1227214000	USD
CY2020Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	3776000	USD
CY2020Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	9576000	USD
CY2020Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	339565000	USD
CY2020Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	11706000	USD
CY2020Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	9556000	USD
CY2020Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	667863000	USD
CY2020Q3	us-gaap	Long Term Debt LongTermDebt	1042042000	USD
CY2020Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	8581000	USD
CY2020Q3	cmc	Long Term Debt Net Of Finance Leases LongTermDebtNetOfFinanceLeases	1033461000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2500000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	300000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	7300000	USD
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CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	36608000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	334170000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	194986000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	86731000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	73474000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	78653000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	370778000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	268460000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	165384000	USD
CY2020	cmc	Current Federal Tax Expense Benefit From Continuing And Discontinued Operations CurrentFederalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	26901000	USD
CY2019	cmc	Current Federal Tax Expense Benefit From Continuing And Discontinued Operations CurrentFederalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	621000	USD
CY2018	cmc	Current Federal Tax Expense Benefit From Continuing And Discontinued Operations CurrentFederalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	20210000	USD
CY2020	cmc	Current Foreign Tax Expense Benefit From Continuing And Discontinued Operations CurrentForeignTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	7588000	USD
CY2019	cmc	Current Foreign Tax Expense Benefit From Continuing And Discontinued Operations CurrentForeignTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	14006000	USD
CY2018	cmc	Current Foreign Tax Expense Benefit From Continuing And Discontinued Operations CurrentForeignTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	18308000	USD
CY2020	cmc	Current State And Local Tax Expense Benefit From Continuing And Discontinued Operations CurrentStateAndLocalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	7133000	USD
CY2019	cmc	Current State And Local Tax Expense Benefit From Continuing And Discontinued Operations CurrentStateAndLocalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	2892000	USD
CY2018	cmc	Current State And Local Tax Expense Benefit From Continuing And Discontinued Operations CurrentStateAndLocalTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	2263000	USD
CY2020	cmc	Current Income Tax Expense Benefit From Continuing And Discontinued Operations CurrentIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	41622000	USD
CY2019	cmc	Current Income Tax Expense Benefit From Continuing And Discontinued Operations CurrentIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	17519000	USD
CY2018	cmc	Current Income Tax Expense Benefit From Continuing And Discontinued Operations CurrentIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	40781000	USD
CY2020	cmc	Deferred Federal Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredFederalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	45771000	USD
CY2019	cmc	Deferred Federal Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredFederalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	46922000	USD
CY2018	cmc	Deferred Federal Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredFederalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-11501000	USD
CY2020	cmc	Deferred Foreign Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredForeignIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-43000	USD
CY2019	cmc	Deferred Foreign Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredForeignIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	490000	USD
CY2018	cmc	Deferred Foreign Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredForeignIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-169000	USD
CY2020	cmc	Deferred State And Local Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredStateAndLocalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	5832000	USD
CY2019	cmc	Deferred State And Local Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredStateAndLocalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	4908000	USD
CY2018	cmc	Deferred State And Local Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredStateAndLocalIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	1002000	USD
CY2020	cmc	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	51560000	USD
CY2019	cmc	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	52320000	USD
CY2018	cmc	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-10668000	USD
CY2020	cmc	Income Tax Expense Benefit From Continuing And Discontinued Operations IncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	93182000	USD
CY2019	cmc	Income Tax Expense Benefit From Continuing And Discontinued Operations IncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	69839000	USD
CY2018	cmc	Income Tax Expense Benefit From Continuing And Discontinued Operations IncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	30113000	USD
CY2020	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	706000	USD
CY2019	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	158000	USD
CY2018	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-34000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	92476000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30147000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.257
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	77863000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	56377000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	42471000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9895000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6085000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2317000	USD
CY2020	cmc	Effective Income Tax Rate Reconciliation Impairmenton Valuationof Subsidiaries EffectiveIncomeTaxRateReconciliationImpairmentonValuationofSubsidiaries	-5084000	USD
CY2019	cmc	Effective Income Tax Rate Reconciliation Impairmenton Valuationof Subsidiaries EffectiveIncomeTaxRateReconciliationImpairmentonValuationofSubsidiaries	29697000	USD
CY2018	cmc	Effective Income Tax Rate Reconciliation Impairmenton Valuationof Subsidiaries EffectiveIncomeTaxRateReconciliationImpairmentonValuationofSubsidiaries	-22315000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-1346000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-1466000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-5973000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	1085000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	580000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	4707000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	968000	USD
CY2020	cmc	Effective Income Tax Rate Reconciliation Toll Chargeand Related Foreign Tax Credits EffectiveIncomeTaxRateReconciliationTollChargeandRelatedForeignTaxCredits	0	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	36167000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-20839000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	-8000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	9799000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	17414000	USD
CY2019	cmc	Effective Income Tax Rate Reconciliation Toll Chargeand Related Foreign Tax Credits EffectiveIncomeTaxRateReconciliationTollChargeandRelatedForeignTaxCredits	7410000	USD
CY2018	cmc	Effective Income Tax Rate Reconciliation Toll Chargeand Related Foreign Tax Credits EffectiveIncomeTaxRateReconciliationTollChargeandRelatedForeignTaxCredits	29466000	USD
CY2020	cmc	Effective Income Tax Rate Reconciliation Remeasurementof Deferred Tax Balances EffectiveIncomeTaxRateReconciliationRemeasurementofDeferredTaxBalances	0	USD
CY2019	cmc	Effective Income Tax Rate Reconciliation Remeasurementof Deferred Tax Balances EffectiveIncomeTaxRateReconciliationRemeasurementofDeferredTaxBalances	586000	USD
CY2018	cmc	Effective Income Tax Rate Reconciliation Remeasurementof Deferred Tax Balances EffectiveIncomeTaxRateReconciliationRemeasurementofDeferredTaxBalances	25515000	USD
CY2020	cmc	Incometaxreconciliationtaxreorganization Incometaxreconciliationtaxreorganization	0	USD
CY2019	cmc	Incometaxreconciliationtaxreorganization Incometaxreconciliationtaxreorganization	120000	USD
CY2018	cmc	Incometaxreconciliationtaxreorganization Incometaxreconciliationtaxreorganization	-3187000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	0	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	0	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	18926000	USD
CY2020	cmc	Effective Tax Rate Reconciliation Worthless Stock Amount EffectiveTaxRateReconciliationWorthlessStockAmount	0	USD
CY2019	cmc	Effective Tax Rate Reconciliation Worthless Stock Amount EffectiveTaxRateReconciliationWorthlessStockAmount	0	USD
CY2018	cmc	Effective Tax Rate Reconciliation Worthless Stock Amount EffectiveTaxRateReconciliationWorthlessStockAmount	-6084000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1089000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	5650000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1629000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	92476000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30147000	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.249
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.260
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.182
CY2020Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	283416000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	295241000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	32293000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	24432000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	30371000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	42833000	USD
CY2020Q3	cmc	Deferred Tax Assets Right Of Use Operating Lease Liabilities DeferredTaxAssetsRightOfUseOperatingLeaseLiabilities	29619000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3315000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	19526000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	379014000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	382032000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	281849000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	283560000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	97165000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	98472000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	185595000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	168701000	USD
CY2020Q3	cmc	Deferred Tax Liabilities Right Of Use Operating Lease Assets DeferredTaxLiabilitiesRightOfUseOperatingLeaseAssets	28201000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2420000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1182000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	216216000	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	169883000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	119051000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	71411000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8652000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3121000	USD
CY2017Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9283000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	5531000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3121000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	8028000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1255000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	31900000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	25100000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8652000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8652000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3121000	USD
CY2020Q3	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	3100000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	23900000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	16700000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P3Y
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	5669972	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	26700000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	19900000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	30300000	USD
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	3200000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	31661000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	0	USD
CY2020	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Benefit Obligation DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	0	USD
CY2019	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Benefit Obligation DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	26336000	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	335000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	354000	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	892000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	926000	USD
CY2020	us-gaap	Defined Benefit Plan Curtailments DefinedBenefitPlanCurtailments	1314000	USD
CY2019	us-gaap	Defined Benefit Plan Curtailments DefinedBenefitPlanCurtailments	0	USD
CY2020	us-gaap	Defined Benefit Plan Special Termination Benefits DefinedBenefitPlanSpecialTerminationBenefits	1918000	USD
CY2019	us-gaap	Defined Benefit Plan Special Termination Benefits DefinedBenefitPlanSpecialTerminationBenefits	0	USD
CY2020	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	1280000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	4883000	USD
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	1270000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	838000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	36130000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	31661000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	23435000	USD
CY2018Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	0	USD
CY2020	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Plan Assets DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets	0	USD
CY2019	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Plan Assets DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets	21023000	USD
CY2020	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	2248000	USD
CY2019	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	2887000	USD
CY2020	us-gaap	Defined Benefit Plan Administration Expenses DefinedBenefitPlanAdministrationExpenses	496000	USD
CY2019	us-gaap	Defined Benefit Plan Administration Expenses DefinedBenefitPlanAdministrationExpenses	69000	USD
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	5284000	USD
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	432000	USD
CY2020	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	1270000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	838000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	29201000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	23435000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-6929000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-8226000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	3234000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	2823000	USD
CY2020	us-gaap	Defined Benefit Plan Cost Of Providing Special Or Contractual Termination Benefit Recognized During Period DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod	1918000	USD
CY2019	us-gaap	Defined Benefit Plan Cost Of Providing Special Or Contractual Termination Benefit Recognized During Period DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod	0	USD
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	-1314000	USD
CY2019	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	0	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	3575000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	522000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-3642000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-2823000	USD
CY2020	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	3232000	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	410000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	2823000	USD
CY2020	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	3985000	USD
CY2019	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	3345000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.028
CY2019Q3	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.032
CY2020	cmc	Defined Benefit Plan Effective Interest Rateon Benefit Obligations DefinedBenefitPlanEffectiveInterestRateonBenefitObligations	0.028
CY2019	cmc	Defined Benefit Plan Effective Interest Rateon Benefit Obligations DefinedBenefitPlanEffectiveInterestRateonBenefitObligations	0.043
CY2020	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Effective Ratefor Service Cost DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEffectiveRateforServiceCost	0.033
CY2019	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Effective Ratefor Service Cost DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEffectiveRateforServiceCost	0.047
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.060
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.060
CY2020	cmc	Defined Benefit Plan Effective Interest Rate On Benefit Obligations Remeasured DefinedBenefitPlanEffectiveInterestRateOnBenefitObligationsRemeasured	0.029
CY2020	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Effective Rate For Service Cost Remeasured DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEffectiveRateForServiceCostRemeasured	0.035
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.06
CY2020Q3	cmc	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Longterm Rateof Returnon Plan Assets Year Two DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongtermRateofReturnonPlanAssetsYearTwo	0.05
CY2020Q3	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	0	USD
CY2020Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2019Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2020Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	2082000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	1856000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	1843000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	1830000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	1790000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	8701000	USD
CY2015Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	100000000.0	USD
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2018	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2020Q3	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	27600000	USD
CY2020Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2020Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1.00
CY2020Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	278302000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	198779000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	135237000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	118921854	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	117834558	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	116822583	shares
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.34
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.69
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.16
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	118921854	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	117834558	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	116822583	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1387767	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1290070	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1323265	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	120309621	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	119124628	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	118145848	shares
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.31
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.67
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.14
CY2020Q3	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	3400000	USD
CY2019Q3	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	3600000	USD
CY2020Q3	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	2700000	USD
CY2019Q3	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	1800000	USD
CY2020Q3	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	164442000	USD
CY2020Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	43362000	USD
CY2019Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	38660000	USD
CY2019Q3	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	133705000	USD
CY2020Q3	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	39375000	USD
CY2019Q3	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	38485000	USD
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segments
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	278302000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	198779000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	135237000	USD
CY2020	us-gaap	Interest Expense InterestExpense	61837000	USD
CY2019	us-gaap	Interest Expense InterestExpense	71373000	USD
CY2018	us-gaap	Interest Expense InterestExpense	40957000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	92476000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	69681000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30147000	USD
CY2020	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	29367000	USD
CY2019	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	74784000	USD
CY2018	cmc	Amortization Acquired Unfavorable Contract Backlog AmortizationAcquiredUnfavorableContractBacklog	0	USD
CY2020	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	7611000	USD
CY2019	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	384000	USD
CY2018	cmc	Asset Impairment Charges From Continuing Operations AssetImpairmentChargesFromContinuingOperations	14372000	USD
CY2020	cmc	Adjusted Operating Profit Loss From Continuing Operation AdjustedOperatingProfitLossFromContinuingOperation	576608000	USD
CY2019	cmc	Adjusted Operating Profit Loss From Continuing Operation AdjustedOperatingProfitLossFromContinuingOperation	424085000	USD
CY2018	cmc	Adjusted Operating Profit Loss From Continuing Operation AdjustedOperatingProfitLossFromContinuingOperation	352221000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5476486000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5829002000	USD
CY2020Q3	us-gaap	Gross Profit GrossProfit	263407000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	82755000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	4643723000	USD
CY2020Q3	us-gaap	Noncurrent Assets NoncurrentAssets	1708344000	USD
CY2019Q3	us-gaap	Noncurrent Assets NoncurrentAssets	1599218000	USD
CY2018Q3	us-gaap	Noncurrent Assets NoncurrentAssets	1172607000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1384708000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1340963000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1341683000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1409132000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	238194000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	217867000	USD
CY2020Q2	us-gaap	Gross Profit GrossProfit	225330000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	63596000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	64169000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	67782000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	83348000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	63798000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	64734000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	67623000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.70
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.53
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.54
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.57
CY2019Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.69
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.53
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.53
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.56
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.70
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.54
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.54
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.53
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.54
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2018Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1277342000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1402783000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1605872000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1543005000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	158909000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	150290000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	241630000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	252659000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	19420000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	14928000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	78551000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	85880000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	19742000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	13850000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	78390000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	86111000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.17
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.13
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.67
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.73
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.16
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.13
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.66
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.72
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.17
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.12
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.66
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.12
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	32100000	USD
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	5669972	shares

Files In Submission

Name	View Source	Status
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exhibit10iiibto8312020_f003.jpg	Edgar Link	pending
exhibit10iiibto8312020_f004.jpg	Edgar Link	pending
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exhibit10iiibto8312020_f012.jpg	Edgar Link	pending
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$CMC
COMMERCIAL METALS Co Stock $cmc

2020 Q3 Form 10-K Financial Statement

#000002244420000047 Filed on October 15, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMC COMMERCIAL METALS Co Stock $cmc

2020 Q3 Form 10-K Financial Statement

#000002244420000047 Filed on October 15, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMC
COMMERCIAL METALS Co Stock $cmc